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A spokeswoman said: "We are working with other emergency services, military and health partners to ensure the continued safety of anyone who uses the woods and to establish if any further canisters are present.

"We would ask people to avoid the area for the time being."

Lincolnshire Police are also using drones to assess the area while the cordon is in place.

A scout hut in the woods where it is believed the canisters were found

The area, formerly known as RAF Woodhall Spa, opened in February 1942 as a satellite of RAF Coningsby and closed in the mid 1960s.

If anyone has recently recovered any bottles or other containers from this area, they are asked to contact 101.